your 194s are polarity-sensitive, so they'll only work with the park lights on. They will turn OFF when the blinkers are flashing ON. If you had non-polarity-sensitive 194s, the corners would flash ON with the blinkers as well with the park lights off. This is normal operation, because the corner lights ground through the front lights' filaments - so when the park lights are on, the corner lights ground THROUGH the blinker bulbs' "bright" side. Park lights off, they ground through the blinker bulbs' "dim" side when you turn on the blinkers. YMMV, but some LED bulbs don't play nice in this arrangement and won't light up at all with the park lights off.
My 5-way 194s from SuperBrightLEDs.com are ones that DO work in this arrangement.